مقايسه كمي و كيفي استقرار زادآوري طبيعي گونه هاي راش ، افرا و ممرز در توده هاي جنگلي تحت مديريت با شيوه هاي تك گزيني درختي و گروهي (طرح جنگلداري دكتر بهرام نيا)

Quantity and quality comparison of natural regeneration stablishment Fagus, Acer and Carpinus in the forest stands under management of tree and group selection systems (Dr. Bahramnia forest management plan)

With regard to desired natural regeneration stablishment that it is the goal of selection systems. The role of tree and group selection silvicultural systems on the quantity and quality of natural regeneration was conducted at four parcels of district no. 1 in Dr. Bahramnia forest, Gorgan (the systems had been executed ten years ago). First, 80 circular sample plots (1000 square meter) has been selected by use of random systematic inventory. Then into the each plots nine micro-plots defined (3 by 3=9 square meter, total 720miro-plots). In the end, collecting of data by counting the seedlings number, height measurements and health evaluation has been done in the micro plots. The results of oneway analysis of variance, multiple ranges Tukey - HSD test and Chi- square test of seedlings showed that there is significanct difference in the level of 0105 between mean of seedlings number, mean of carpinus seedlings number, percent of the health, shining, even and vertical seedlings in tree selection and group selection systems. So in the stablishment of natural regeneration the quantity and quality of natural regeneration in tree selection system is more desireable than group selection system. In the bigger cutting sites the stand comes out of his climax conditions and in the result it will reduce the stablishment percent of original species regeneration. With regard to the desireable results of tree selection system it is necessary to recommend that tree selection system should be write down in forest management plans descriptions.